Hello . . . (If hoffe Sie können die Englische Sprache lesen.) I’am an starter hobbyist and like to measure small amount of ionizing radiation. I already build an simple counter with the SI8-B tube for Beta and gammaI did an order for the SBT10A tube today. To measure better Alpha particles. I try to read the specification sheet (I found on pripyat website).But I can’t read Russian language. I looked for an circuit online, how connect this tube but did found only 1 website.How should I connect this tube to my counter ? I bought as counter the High Voltage Geiger Probe Driver from rhelectronics.

The Kathode (Minus) is High Voltage Geiger Probe Driver connect to the earth, that seems not the problem.But the Anode (+) ? Should I just parallel connect them ? (I saw that on a photo on Ebay) or Should I give every single Anode an 10 MΩ resistor and then connect them ? Like this: http://shaddack.brutowave.com/projects/ ... akeGeiger/

I looked for an circuit online, how connect this tube but did found only 1 website.How should I connect this tube to my counter ? I bought as counter the High Voltage Geiger Probe Driver from rhelectronics.

Don't know this thing but judging from its website it starts at 420 V whilethe SBT10A apparently likes to see 400 V. I have no experience with theSBT10A but it should be OK with 420 V. It probably won't blow off but itmight hurt its life expectancy slighlty. Best would be to dim the sourcedown to some 390 V...

The Kathode (Minus) is High Voltage Geiger Probe Driver connect to the earth, that seems not the problem.But the Anode (+) ? Should I just parallel connect them ? (I saw that on a photo on Ebay) or Should I give every single Anode an 10 MΩ resistor and then connect them ? Like this: http://shaddack.brutowave.com/projects/ ... akeGeiger/

Well, this depends on the detection circuit of the rhelectronics board. If itgrabs the pulses from the tube's cathode (as shown on your pancakegeiger link), you will be happy by connecting it the same way.

NEVER COMBINE THE ANODES TOGETHER DIRECTLY AND WITHOUTINDIVIDUAL RESISTORS!

This will impose a noteworthy capacitive load which will be dischargedentirely for each pulse and puts a somewhat high burden onto the tube.Same applies for the wires between the resistor(s) and the anode(s):Always keep them as short as possible.

it seems that the tube's cathode is connected to the system's groundand they are detecting the pulses on the anode's end. We have justlearned that you should not combine all the anodes without theirindividual resistors (see above). But if you connect the anodes asthey should be and attach the "virtual" common anode to therhelectronics thingie, you will probably lose too much of the pulseto be detected properly. You just have to try...

One first step might be to connect just one anode (without a resistor) and keep the others floating. If it counts it is good andyou're on the right path but beware that you will lose approx.90% of all events (as only one anode is connected).

Next would be to check how the anode detection is implementedin the rhelectronics board. If it's the standard version (resistive voltage divider with a capacitor attached to the tap) we might tryto remove the anode's end resistor and replace it by the virtualcommon anode from above. But this is all wild guessing -- itwould help a lot if we had some schematics (at least for thedetection circuit) of the rhelectronics board...

Thanks you for your detailed reply. Today the sensor came with the mail.If I connect one or more sections to the MyGeiger Dosimeter the meter works OK (it counts).

It takes more time to remove the 4M7 resistor on the print-board and the solder 10 external resistor so that I can determine if each anode get an ‘personal’ 4M7 (10M) resistor the counter provides better sensitivity.

cmug hat geschrieben:The pulses are measured in the kathode side of the tube.

Yes, so you are lucky. Apparently the anode is only used for this "externalprobe enclosure"...

It takes more time to remove the 4M7 resistor on the print-board and the solder 10 external resistor so that I can determine if each anode get an ‘personal’ 4M7 (10M) resistor the counter provides better sensitivity.

Giving each anode its own resistor is primarily not for sensitivity reasons.As I wrote this is needed to not ruin the tube prematurely. Of course, you_CAN_ combine all anodes together directly -- this way, when one anodetriggers, it simply discharges all others as well. But this will stress thedischarging anode (as there are 10 anodes to discharge instead just one).Yes, it will also reduce (just a bit) of sensitivity as all anodes can't countwhen one has just triggered (and discharged all others). But this probablywon't be noticed under background conditions.

When picking the resistors be sure to use the correct ones. If I look at R22on page 9 of your PDF it seems that they use a standard resistor. This iscrap. It should be capable of withstanding 500+ Volts. In the current GS,which uses THT resistors, I used the Vishay VR25 series, e.g: